Search for Dark Matter with ATLAS: Using Events with a Highly Energetic Jet and Missing Transverse Momentum in Proton-Proton Collisions at √s = 8 TeV

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Springer, Jun 29, 2016 - Science - 322 pages
This thesis describes in detail a search for weakly interacting massive particles as possible dark matter candidates, making use of so-called mono-jet events. It includes a detailed description of the run-1 system, important operational challenges, and the upgrade for run-2. The nature of dark matter, which accounts for roughly 25% of the energy-matter content of the universe, is one of the biggest open questions in fundamental science. The analysis is based on the full set of proton-proton collisions collected by the ATLAS experiment at the Large Hadron Collider at √s = 8 TeV. Special attention is given to the experimental challenges and analysis techniques, as well as the overall scientific context beyond particle physics. The results complement those of non-collider experiments and yield some of the strongest exclusion bounds on parameters of dark matter models by the end of the Large Hadron Collider run-1.
Details of the upgrade of the ATLAS Central Trigger for run-2 are also included.

 

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Contents

1 Introduction
2
Part I Theory and Motivation
6
2 The Standard Model of Particle Physics
7
3 Dark Matter
21
4 ProtonProton Collisions
44
5 MonoJet Events as Dark Matter Signature at Colliders
61
Part II Experimental Facilities
73
6 The Large Hadron Collider
75
10 Analysis Strategy
148
11 Data and Simulated Samples
159
12 Physics Objects Definitions
171
13 Event Selection
176
14 Background Estimation
195
15 Results and Interpretation
251
16 Prospects with Future LHC Data
277
Part V Conclusion
286

7 The ATLAS Experiment
83
Part III Operation and Upgrade of the Central Trigger
115
8 Operation of the Central Trigger During RunI
117
9 Upgrade of the Central Trigger
131
Part IV Analysis
147
17 Conclusion
289
Appendix ASignal Simulation Samples
293
Appendix BSignal Tables
299
Curriculum Vitae
320
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About the author (2016)

The author obtained her Diploma in Physics at the University of Mainz (JGU), Germany, in 2011 upon completion of her research project on a differential cross-section measurement of Z-boson production with the ATLAS experiment. As a CERN doctoral student, funded by a Wolfgang-Gentner-Scholarship, she made essential contributions to the operation and upgrade of the ATLAS Central Trigger and conducted a search for Dark Matter in so-called mono-jet events. She obtained her PhD "with distinction" at JGU in May 2015 and was awarded prizes for an outstanding thesis both from the ATLAS collaboration and from the physics department of JGU. Since March 2015 she has been a postdoctoral researcher at Stockholm University, coordinating the ATLAS search for leptoquarks.

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